drm/msm/dpu: stop passing mdss_ver to setup_timing_gen()

drm/msm/dpu: stop passing mdss_ver to setup_timing_gen()

As a preparation to further MDSS-revision cleanups stop passing MDSS
revision to the setup_timing_gen() callback. Instead store a pointer to
it inside struct dpu_hw_intf and use it diretly. It's not that the MDSS
revision can chance between dpu_hw_intf_init() and
dpu_encoder_phys_vid_setup_timing_engine().

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/655362/
Link: https://lore.kernel.org/r/20250522-dpu-drop-features-v5-1-3b2085a07884@oss.qualcomm.com